Not much I can do about that really, you would have to drive carefully and slowly to Garching. If conditions really were so bad that it makes driving impossible, you would have to obtain snow chains outisde BMW Welt.

Would chains on summer tires be legal should you have an accident?
We're waiting for an ED date for the wife's 335i, no way is she going to
drive in the snow. So if weather is poor it would be on with chains (or flatbed)
and drive to the nearest drop off point.
Me, I'd rent tires and drive the bad boy.